The vertebral canal runs throughout the greater part of the sacral

Sacral

Sacral may refer to:*sacred*sacrum...

 bone; above, it is triangular in form; below, its posterior wall is incomplete, from the non-development of the laminæ and spinous processes.

It lodges the sacral nerves

Sacral nerves

The five sacral nerves emerge from the sacrum. Although the vertebral components of the sacrum are fused into a single bone, the sacral vertebrae are still used to number the sacral nerves....

, and its walls are perforated by the anterior and posterior sacral foramina

Posterior sacral foramina

Lateral to the articular processes of the sacrum are the four posterior sacral foramina ; they are smaller in size and less regular in form than the anterior, and transmit the posterior divisions of the sacral nerves....

through which these nerves pass out.

External links

- "Sacrum, Median Sagittal Section" - "The Female Pelvis: Bones"